Chemistry crossword

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Across
  1. 2. positively charged particle in the nucleus of an atom
  2. 5. vertical column of elements in the periodic table;elements in a family all have similar chemical properties;also called a group
  3. 7. catalyst involved in chemical reactions in living things
  4. 8. invisible negatively charged particle that orbits the nucleus of an atom
  5. 10. group 17 elements in the periodic table;the most reactive non-metals
  6. 12. element that has both metallic and non-metallic properties
  7. 14. description of a substance that can be pounded or rolled into sheets
  8. 16. horizontal row of elements in the periodic table
  9. 17. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  10. 18. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
  11. 19. group of atoms joined by covalent bonds
  12. 22. atom that has become electrically charged because it has lost or gained electrons;a positive ion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one or more electrons
  13. 23. positively charged centre of an atom;contains protons and neutrons
Down
  1. 1. ability to do work
  2. 3. neutral particle in a nucleus of an atom
  3. 4. combination of pure substances;unlike a compound,the components of a mixture do not combine chemically and are not always in the same ratio
  4. 6. amount of mass in a given volume of a substance
  5. 9. variations within a species
  6. 11. pure substance that cannot be broken down into other substances;substance made up of only one type of atom
  7. 13. new substances produced in a chemical reaction between reactants
  8. 15. the smallest part of an element that is representative of that element;a neutral particle made up of a nucleus containing protons and neutrons,and in which the number of electrons equals the number of protons
  9. 17. substance that helps a chemical reaction to proceed more quickly
  10. 19. shiny,malleable,ductile element that conducts electricity
  11. 20. chemical combination of two or more elements in a specific ratio
  12. 21. organic molecules made up of atoms of carbon,hydrogen and oxygen (ex,fats,oils and waxes);lipids are insoluble in water